[jira] [Commented] (HIVE-4960) lastAlias in CommonJoinOperator is not used

["Phabricator (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725787#comment-13725787 ] 

Phabricator commented on HIVE-4960:
-----------------------------------

ashutoshc has accepted the revision "HIVE-4960 [jira] lastAlias in CommonJoinOperator is not used".

  +1

REVISION DETAIL
  https://reviews.facebook.net/D11895

BRANCH
  HIVE-4960

ARCANIST PROJECT
  hive

To: JIRA, ashutoshc, yhuai

                
> lastAlias in CommonJoinOperator is not used
> -------------------------------------------
>
>                 Key: HIVE-4960
>                 URL: https://issues.apache.org/jira/browse/HIVE-4960
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>            Priority: Minor
>         Attachments: HIVE-4960.D11895.1.patch
>
>
> In CommonJoinOperator, there is object called lastAlias. The initial value of this object is 'null'. After tracing the usage of this object, I found that there is no place to change the value of this object. Also, it is only used in processOp in JoinOperator and MapJoinOperator as
> {code}
> if ((lastAlias == null) || (!lastAlias.equals(alias))) {
>   nextSz = joinEmitInterval;
> }
> {\code}
> Since lastAlias will always be null, we will assign joinEmitInterval to nextSz every time we get a row. Later in processOp, we have 
> {code}
> nextSz = getNextSize(nextSz);
> {\code}
> Because we reset the value of nextSz to joinEmitInterval every time we get a row, seems that getNextSize will not be used as expected.

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